CN101680637B - Lighting device and liquid crystal display - Google Patents
Lighting device and liquid crystal display Download PDFInfo
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- CN101680637B CN101680637B CN2008800173287A CN200880017328A CN101680637B CN 101680637 B CN101680637 B CN 101680637B CN 2008800173287 A CN2008800173287 A CN 2008800173287A CN 200880017328 A CN200880017328 A CN 200880017328A CN 101680637 B CN101680637 B CN 101680637B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0028—Light guide, e.g. taper
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0078—Side-by-side arrangements, e.g. for large area displays
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0078—Side-by-side arrangements, e.g. for large area displays
- G02B6/008—Side-by-side arrangements, e.g. for large area displays of the partially overlapping type
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
- G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
A backlight (lighting device) (2) comprises a plurality of light sources (5), and a plurality of photoconductors (7, 17, and so on). Each photoconductor (7, 17, and so on) includes a light-emitting portion (7b, 17b, and so on) having a light-emitting surface (7a), and a photoconductive portion (7c) for guiding light from the light source (5) to the light emitting portion (7b, 17b, and so on), and the photoconductors (7, 17, and so on) are arranged such that the light-emitting portion (17b) of another photoconductor (17) comes on top of the photoconductive portion (7c) of one photoconductor (7) adjacent to the photoconductor (17). A light amount regulating portion (11) for reducing the quantity of received light is arranged between the light-emitting portion (7b) of the one photoconductor (7) and the light-emitting portion (17b) of the another photoconductor (17). A lighting device further improved in uniformity of luminance can thereby be obtained.
Description
Technical field
The present invention relates to lighting device as the uses such as backlight of liquid crystal indicator, and the liquid crystal indicator with this lighting device.
Background technology
In recent years, the liquid crystal indicator that replaces cathode ray tube (CRT) to popularize is rapidly applied flexibly advantage such as it is energy-conservation, thin, light weight and is widely used in LCD TV, monitor, the portable phone etc.As the method for further applying flexibly these advantages, can enumerate the improvement of the lighting device (so-called backlight) of the behind that is configured in liquid crystal indicator.
Lighting device mainly is divided into side light type (being also referred to as edge light type) and full run-down type.Side light type has the structure that is provided with light conductor in the behind of display panels, is provided with light source in the horizontal end of light conductor.The light that penetrates from light source is reflected by light conductor, indirectly the uniform irradiation display panels.According to this structure,, can realize to carry out the lighting device of slimming and brightness uniformity excellence though brightness is low.Therefore, the lighting device of side light type mainly uses in middle-size and small-size LCD such as portable phone, notebook computer.
As an example of side light type lighting device, can enumerate the lighting device that patent documentation 1 is put down in writing.In patent documentation 1, record, on the reflecting surface of light guide plate, be formed with the surface illuminating device of a plurality of points, make it possible to send uniform light from light-emitting area.In this surface illuminating device, the bight of reflecting surface does not arrive owing to the directive property of light source has light, so therefore deepening, makes the density of point in this bight higher than other parts.
In addition, the lighting device of full run-down type is arranged with a plurality of light sources in the behind of display panels, and the direct irradiation display panels.Thereby,, mainly in the large-scale LCD more than 20 inches, use even big picture also obtains high brightness easily.But the thickness of the lighting device of existing full run-down type can hinder the further slimming of display for about about 20mm～40mm.
Approaching by the distance that makes light source and display panels, can in large-scale LCD, reach further slimming, but in this case,, then can not obtain the homogeneity of the brightness in the lighting device if the quantity of light source is not a lot.On the other hand, if increase the quantity of light source then cost uprises.Therefore, wish not increase the lighting device that the exploitation of quantity ground is slim and brightness uniformity is excellent of light source.
All the time, in order to address these problems, attempt making large-scale LCD slimming by the lighting device of arranging a plurality of side light types.
For example, in patent documentation 2,, proposed to be applicable to the planar light source device of large-scale LCD in order in the structure of compactness, to guarantee wide light-emitting zone.This planar light source device has to be made tabular leaded light piece arranged in series and has the structure of tandem type of supplying with once the primary source of light to each leaded light piece respectively.
As mentioned above, arrange a plurality of combined light sources and light conductor and the luminescence unit that constitutes and the lighting device that constitutes, be called as the lighting device of tandem type.
Patent documentation 1: Japanese publication communique [spy open 2003-43266 communique (open day: on February 13rd, 2003)]
Patent documentation 2: Japanese publication communique [spy open flat 11-288611 communique (open day: on October 19th, 1999)]
Patent documentation 3: Japanese publication communique [spy open 2001-312916 communique (open day: November 9 calendar year 2001)]
Summary of the invention
But, in the lighting device that constitutes at aforesaid combination light conductor and light source, under the situation that makes a plurality of light conductor planar alignment, owing to bright line occurs in the zone of the seam portion that is equivalent to light conductor, and the brightness uneven problem that becomes still can appear in the generation brightness disproportionation.
Here, the principle that bright line is produced describes.Figure 13 is the sectional view of schematic configuration of the light conductor of the expression backlight that constitutes tandem type.In addition, Figure 15 and Figure 16 are the figure that is shown schematically in the direct of travel of the light of propagating in the above-mentioned light conductor.
As shown in figure 13, light conductor (left side among the figure) and another light conductor (right side among the figure) that light conductor is adjacent therewith constitute do not form overlapping with gap.From the light that light source penetrates, as shown in figure 15, major part is carried out total reflection repeatedly and is propagated in light conductor, penetrate to the outside from light-emitting area.But the part of the light that penetrates from light source as shown in figure 16, is not carried out total reflection in light conductor, and directly arrival is away from a side's of light source end face (7e).These light do not produce the decay of light quantity by total reflection, so intensity is big.So the light in that above-mentioned end face (7e) penetrates shows as bright line.
About this point, according to the structure of Figure 13, the light that penetrates away from the end face (7e) of a side of light source from another light conductor (right side the figure) be incident to a light conductor (left side among the figure), and portion is propagated (the thick arrow among the figure) within it.Then, in this light conductor, carry out total reflection repeatedly, from the light-emitting area ejaculation of a light conductor.Like this, in the structure of Figure 13,, can obtain uniform brightness owing to utilize the light-emitting area that a plurality of light conductors form does not have interruption with not producing bright line.
But, in actual applications, consider each other damage of light conductor, the slimming of lighting device, the error in the manufacturing etc., general light conductor is manufactured with minus tolerance.Therefore, as shown in figure 14, produce gap corresponding to tolerance in the seam portion of a light conductor and another light conductor.Therefore, the light that the end face (7e) away from a side of light source from another light conductor penetrates is divided into to the light of a light conductor incident and the light (the thick arrow among the figure) that do not spill upward to a light conductor incident.Like this from end face (7e) rather than the light that penetrates from light-emitting area, as mentioned above, light amount ratio is many from the light that light-emitting area penetrates, so the brightness height.So the light that spills upward from this end face (7e) shows as bright line.
In order to solve the problem of above-mentioned bright line, for example, record following structure in patent documentation 3: will make from the dot pattern of the light diffusion of light guide plate ejaculation, whole ground is configured between light guide plate and diffuser plate.According to such structure, can make the light diffusion that becomes bright line, thereby can reduce the unevenness of brightness.
But, in above-mentioned structure,, produced the problem of the new brightness disproportionation that the some pattern by dot pattern causes though can reduce the problem of the brightness disproportionation that causes by bright line.Dot pattern has the light of making diffusion and makes the even brightness effect, but is difficult to make the complete homogenising of brightness.Therefore, make the some pattern of the dot pattern that the different mode of distribution density disposes, can impact brightness disproportionation with distance according to the distance light source.
In addition, in above-mentioned patent documentation 3, record the structure that above-mentioned end face that the light in the reason that becomes bright line penetrated is provided with light shield layer.According to this structure, can block the high light of brightness that penetrates from end face, therefore can suppress bright line.But, in such structure, there is not light to penetrate from above-mentioned end face, therefore concealed wire appears in the zone that causes being equivalent to this part, still is difficult to obtain uniform brightness.
In using the such display device of lighting device as backlight, the decline that can produce display quality.
The present invention proposes in view of the above-mentioned problems, and its purpose is to provide the inhomogeneity lighting device that can further improve brightness.
In order to address the above problem, lighting device of the present invention comprises a plurality of light sources and makes the light of at least one incident from this light source carry out the luminous a plurality of light conductors of face, this lighting device is characterised in that: make the light quantity adjustment part of the transit dose minimizing of light, be configured in above-mentioned each light conductor each other.
In addition, in order to address the above problem, lighting device of the present invention comprises a plurality of light sources and makes the light of at least one incident from this light source carry out the luminous a plurality of light conductors of face that above-mentioned each light conductor comprises: the illuminating part with light-emitting area; With will be from the photoconduction of above-mentioned light source light guide section to this illuminating part, and be configured in the mode of the illuminating part that on the light guide section of a light conductor, is equipped with another light conductor adjacent with this light conductor, this lighting device is characterised in that: the light quantity adjustment part that the transit dose of light is reduced is configured between the illuminating part of the illuminating part of an above-mentioned light conductor and above-mentioned another light conductor.
As mentioned above, the light quantity of the light that the end face apart from a light source far away side different with light-emitting area penetrates from light conductor, more than the light quantity of the light that penetrates from light-emitting area, so the brightness height.So the light that penetrates from above-mentioned end face becomes bright line, produce brightness disproportionation.
For this point, according to above-mentioned structure, make the light quantity adjustment part of the transit dose minimizing of light, be configured in each light conductor each other.
Thus, can reduce from the amount of the light of above-mentioned end face ejaculation.So, the brightness of this light can be suppressed lowlyer than the brightness of the light that directly penetrates to the outside from above-mentioned end face, therefore can reduce the generation of bright line.In addition, in existing structure, the light that penetrates from above-mentioned end face is blocked, relative therewith, in structure of the present invention, can reduce light quantity and it is penetrated to the outside.Therefore can prevent the concealed wire that produces in the prior art.
So, compare with existing structure, can further improve the homogeneity of brightness.
In addition, in order to address the above problem, lighting device of the present invention comprises a plurality of light sources and makes the light of at least one incident from this light source carry out the luminous a plurality of light conductors of face, this each light conductor is with mutual nonoverlapping mode alignment arrangements, and this lighting device is characterised in that: make the light quantity adjustment part of the transit dose minimizing of light be configured in above-mentioned each light conductor each other.
According to the structure of above-mentioned light conductor, can realize a watt lighting device that covers (tile) formula.And, in watt covering the lighting device of formula, also can access the effect identical with above-mentioned effect.Promptly, by above-mentioned light quantity adjustment part is arranged on each light conductor each other, the generation of the bright line that forms owing to the stronger light of intensity that the end face from each light conductor of being positioned at adjacent light conductor border each other penetrates can be suppressed, the homogeneity of brightness can be further improved.
In addition, in lighting device of the present invention, also can be that above-mentioned light quantity adjustment part contacts configuration to cover the mode of the end face that is positioned at this each light conductor border each other in above-mentioned each light conductor with this end face.
According to said structure, the light quantity adjustment part covers end face, and therefore the light that penetrates from this end face can positively be radiated on the light quantity adjustment part.That is, the light from above-mentioned end face penetrates can directly leak to the outside by ground, light quantity adjustment part.Thereby the amount as the light of the reason that produces bright line positively is reduced, therefore can further improves the homogeneity of brightness.
And in lighting device of the present invention, above-mentioned light quantity adjustment part can be made of the semipermeability material that the transit dose that makes light reduces.
In addition, the above-mentioned semipermeability material China ink of grey (ink) preferably.The clandestine meeting blocking light of black, and the China ink of grey has that the amount of the light of the irradiation of making reduces and the character that sees through, this is general known.
Thus, can reduce the amount of the light that sees through from the light quantity adjustment part, therefore can reduce the generation of bright line.
In addition, in lighting device of the present invention, above-mentioned light quantity adjustment part also has when the transit dose that makes light reduces light is carried out function of reflecting.
Thus, the amount of the light that sees through from the light quantity adjustment part is reduced, and the light that exposes to the light quantity adjustment part is reflected, so can make more light diffusion.Thereby can further improve the homogeneity of brightness.
In addition, liquid crystal indicator of the present invention is characterised in that to have above-mentioned any lighting device as backlight.
According to said structure,, can realize the liquid crystal indicator of the excellent in uniformity of brightness by having lighting device of the present invention.
Other purpose of the present invention, feature and excellent point can be fully understood by content shown below.In addition, advantage of the present invention can be by following explanation that the reference accompanying drawing carried out and bright separating.
Description of drawings
Fig. 1 is the sectional view of schematic configuration of the liquid crystal indicator of expression first embodiment of the present invention.
Fig. 2 is the stereographic map of the schematic configuration of the expression light guide unit that liquid crystal indicator had.
Fig. 3 is the amplification sectional view of the part of liquid crystal indicator shown in Figure 1.
Fig. 4 is the amplification stereogram of the part of liquid crystal indicator shown in Figure 3.
Fig. 5 is the sectional view of schematic configuration of the liquid crystal indicator of expression second embodiment of the present invention.
Fig. 6 is the amplification sectional view of the part of liquid crystal indicator shown in Figure 5.
Fig. 7 is the planimetric map of the schematic configuration of the expression backlight that liquid crystal indicator had shown in Figure 5.
Fig. 8 is the planimetric map of another example of the schematic configuration of the expression backlight that liquid crystal indicator had shown in Figure 5.
Fig. 9 (a) observes planimetric map under the situation of the light guide unit that liquid crystal indicator had shown in Figure 5 from the display panels side.(b) be to observe planimetric map under the situation of the light guide unit that liquid crystal indicator had shown in Figure 5 from source backlight.(c) be the A-A sectional view of the light guide unit shown in (a).
Figure 10 (a) is the synoptic diagram of expression from the direct of travel of the light of the light source of a side (left side) that is arranged at light guide unit.(b) be the synoptic diagram of expression from the direct of travel of the light of the light source of the opposite side that is arranged at light guide unit (right side).
Figure 11 is adjacent two light guide units of the expression sectional views of the schematic configuration of the backlight that watt covers formula of alignment arrangements seamlessly.
The sectional view of the schematic configuration of the backlight that watt cover formula of Figure 12 during to be that expression is actual use.
Figure 13 is the sectional view of schematic configuration of the light conductor of the expression backlight that constitutes tandem type.
Figure 14 is the sectional view of schematic configuration of the light conductor of the expression backlight that constitutes the tandem type in actual the use.
Figure 15 is the synoptic diagram that is illustrated in the direct of travel of the light of propagating in the light conductor.
Figure 16 is the synoptic diagram that is illustrated in the direct of travel of the light of propagating in the light conductor.
Symbol description:
1,21 liquid crystal indicators
2,22 backlights (lighting device)
3,23 display panels
4, round substrate
5 light sources (LED, cold-cathode tube)
25 (25L, 25R) light sources (LED)
6,26 reflector plates
7,17,27 light conductors
7a, 27a (light conductor) light-emitting area
7b, 17b illuminating part
The 7c light guide section
7e, 27e end face
8,28 diffuser plates
9,29 optical sheets
10,30 transparent panels
11,31 light quantity adjustment parts
12,32 light guide units
Embodiment
[embodiment 1]
Based on Fig. 1～Fig. 4 first embodiment of the present invention is carried out the following description.In addition, the present invention is not limited thereto.
In the present embodiment, the lighting device that the backlight as liquid crystal indicator is used describes.
Fig. 1 is the sectional view of schematic configuration of the liquid crystal indicator 1 of expression present embodiment.Liquid crystal indicator 1 have backlight 2 (lighting device), with the display panels 3 of backlight 2 relative configurations.
The general display panels that uses in display panels 3 and the existing liquid crystal indicator is identical, though it is not shown, its structure example that has is in this way: comprise the active-matrix substrate and the CF substrate opposed with it that are formed with a plurality of TFT (thin film transistor (TFT)), liquid crystal layer is enclosed between these substrates by encapsulant.
The structure of the backlight 2 that liquid crystal indicator 1 is had is carried out following detailed description.
It is luminous that light conductor 7 makes the light that penetrates from light source 5 carry out face from light-emitting area 7a.Light-emitting area 7a is the face that is used for irradiation object is carried out the irradiation of light.In the present embodiment, as shown in Figure 1, light conductor 7 is a series configuration.Promptly, light conductor 7 comprises: have light-emitting area 7a illuminating part 7b, will be from the photoconduction of light source 5 light guide section 7c to this illuminating part 7b, at least in the coupling part of illuminating part 7b and light guide section 7c, mutual thickness difference, and dispose in the mode that on the light guide section 7c of light conductor 7, is equipped with the illuminating part 17b of another light conductor 17.Thus, by a plurality of light conductors 7,17 ... form plane light-emitting area (light-emitting area of backlight 2 integral body, light-emitting zone).Wherein, symbol 7e represents the end face away from a side of light source 5.
Fig. 2 is the stereographic map of the schematic configuration of the light guide unit 12 that had of expression liquid crystal indicator 1 shown in Figure 1.Light guide unit 12 makes from the light diffusion and the face of light source 5 ejaculations luminous, is made of light source 5, substrate 4 (with reference to Fig. 1), reflector plate 6, light conductor 7.As shown in Figure 2,, be incident to the light guide section 7c of light conductor 7, in light guide section 7c, propagate and arrival illuminating part 7b from the light that light source 5 penetrates.Though not shown, at the front (light-emitting area 7a) or the back side of the illuminating part 7b of light conductor 7, be applied in processing, processing that the light that makes leaded light penetrates to front surface, light penetrates to display panels 3 sides from the light-emitting area 7a of light conductor 7.About concrete job operation, the disposal route that the illuminating part 7b to light conductor 7 implements, for example can enumerate prism processing, fold processing, printing treatment etc., be not particularly limited, can use suitable known method.
In addition, light conductor 7 mainly is made of polycarbonate (PC), polymethylmethacrylate transparent resins such as (PMMA), but is not particularly limited, preferably the high material of light transmission rate.In addition, light conductor 7 can be shaped by ejection formation for example, extrusion molding, hot-forming, cut etc.But, be not limited to these manufacturing process, get final product so long as can bring into play the job operation of same characteristic.
The amount that the light that exposes to self is reduced in light quantity adjustment part 11 penetrates to the outside again.That is, light quantity adjustment part 11 has the function of the transit dose minimizing that makes light, for example, is made of the semipermeability material.Specifically, for example can form by the China ink that prints white, grey.In addition, also can apply, paste dielectric mirror, polarisation reflector plate, the such half-mirror (halfmirror) of cholesteric crystal layer and form.Further, also can apply resin with high index of refraction.And be not limited thereto, light quantity adjustment part 11 is so long as have the parts of dim light function and get final product.
Utilize the structure of above-mentioned each parts,,, when being subjected to scattering process and reflex, in light conductor 7, propagate, penetrate, arrive display panels 3 by diffuser plate 8 and optical sheet 9 from light-emitting area 7a as Fig. 2 and shown in Figure 15 from the light that light source 5 penetrates.
(about the homogeneity of brightness)
The principle of brightness irregularities is carried out the following description herein.
According to Figure 15, as mentioned above, be incident to the light in the light guide section 7c of light conductor 7 with certain critical angle from light source 5, in light conductor 7c, carry out total reflection repeatedly and arrive illuminating part 7b, be set at reflector plate 6 reflections at the back side of illuminating part 7b, penetrate from light-emitting area 7a.Like this, the major part of the light that penetrates from light source 5 is carried out total reflection repeatedly in light conductor 7, and therefore along with the distance with light source 5 becomes far away, light quantity reduces.
But the part of the light that penetrates from light source 5 as shown in figure 16, is not carried out total reflection in light conductor 7, but directly arrival away from a side's of light source 5 end face 7e.Such light does not have to produce because of total reflection the decay of light quantity, and strength ratio is stronger from the light that light-emitting area 7a penetrates.
In the light conductor of series configuration, as shown in figure 14, produce gappedly on the border of the illuminating part of a light conductor and the illuminating part of another light conductor adjacent with this light conductor, therefore, the end face 7e from the light of light source ejaculation from light conductor directly penetrates to the outside.So the light that this intensity is stronger shows as bright line, whole brightness becomes inhomogeneous.
In the present embodiment, reduce, be provided with light quantity adjustment part 11 in order to make amount as the light reason of bright line, that penetrate from the end face 7e of light conductor.Below the particular location of configuration light quantity adjustment part 11 is described.
(about the structure of light quantity adjustment part 11)
Fig. 3 is the sectional view after the part of liquid crystal indicator shown in Figure 11 is amplified.As shown in Figure 3, light quantity adjustment part 11, be configured in the zone between the illuminating part 17b of the illuminating part 7b that is formed on light conductor 7 and light conductor 17, make it possible to accept the light that the end face 7e of different with the light-emitting area 7a sides away from light source 5 from light conductor 17 penetrates.In addition, among Fig. 3, light quantity adjustment part 11 contacts configuration with end face 7e, but is not limited thereto, as long as be configured in interior can the accepting from the position of the light of end face 7e ejaculation in zone between two illuminating part 7b, the 17b.
Thus, can reduce from light source 5 directly arriving end face 7e, and the amount of the light that penetrates from end face 7e, therefore can reduce the brightness of the light that penetrates from end face 7e.Thereby can suppress the generation of bright line, therefore compare, can further improve the homogeneity of brightness with existing structure.
Like this, the backlight 2 of present embodiment because the restriction of making and the zone (gap that forms) that must form, can be able to realize the peculiar effect of the homogenising of brightness by effective utilization between illuminating part 7b, 17b.
Therefore in addition, light quantity adjustment part 11 only is disposed between illuminating part 7b, the 17b, is not disposed at the zone between light-emitting area 7a and the diffuser plate 8, can be able to realize the effect of the slimming of backlight 2.
, be formed on the zone between the illuminating part 17b of the illuminating part 7b of light conductor 7 and light conductor 17 herein, be formed at the direction vertical with respect to the paper of Fig. 3, therefore, as shown in Figure 4, light quantity adjustment part 11 is preferably along this zone linearity configuration.
In addition, as shown in Figure 3, light quantity adjustment part 11 preferably in the mode of the end face 7e that covers each light conductor, contacts configuration with end face 7e respectively.Thus, the light from the end face 7e away from a side of light source 5 penetrates positively shines in light quantity adjustment part 11.That is, the light from end face 7e penetrates can directly leak to the outside by light quantity adjustment part 11.Thereby can positively reduce amount, therefore can further improve the homogeneity of brightness as the light of the reason of bright line.
In addition, apply processing by the end face 7e to light conductor 7, this end face 7e also can be the structure of performance as the function of light quantity adjustment part 11.Specifically, for example can enumerate the structure of the China ink of coating white, grey on end face 7e.In this structure, do not need to be provided with and the light quantity adjustment part of light conductor 7 for different parts, can realize the miniaturization and the lightweight of backlight 2.
[embodiment 2]
Below, based on Fig. 5～Figure 12 second embodiment of the present invention is described.
In above-mentioned embodiment 1, the backlight of tandem type is illustrated, in the present embodiment, the backlight that watt covers formula that adopts not overlapping and formation alignment arrangements at grade of a plurality of light conductors is described.
Fig. 5 is the sectional view of schematic configuration of the liquid crystal indicator 21 of expression present embodiment, and Fig. 6 is the sectional view after the part of this liquid crystal indicator 21 is amplified.Liquid crystal indicator 21 have backlight 22 (lighting device) with the display panels 23 of backlight 22 relative configurations.Display panels 23 is identical structure with the display panels 3 of embodiment 1.
Then, the structure of the backlight 22 that below liquid crystal indicator 21 is had describes.
It is luminous that light conductor 27 makes the light that penetrates from light source 25 carry out face from light-emitting area 27a.Light-emitting area 27a is the face that is used for irradiation object is carried out the irradiation of light.
In the present embodiment, the light conductor 27 of formation backlight 22 is at least more than two.That is, backlight 22 is will combination light conductor 27 and light source 25 and the light guide unit 32 that forms is arranged a plurality of at grade and constitute.
In addition, as shown in Figure 5 and Figure 6, in the backlight 22 of present embodiment, by with each light guide unit 32 with the alignment arrangements at grade of nonoverlapping mode each other, can by a plurality of light conductors 27,27 ... each light-emitting area 27a form plane light-emitting area (light-emitting area of backlight 22 integral body, light-emitting zone).
In addition, in Fig. 7, schematically show the planar structure of backlight 22.As shown in Figure 7, in the backlight 22, the alignment arrangements on direction in length and breadth of the light guide unit 32 with 2 light source 25L, 25R (paired light source) has a plurality of.Therefore like this, the backlight 22 of present embodiment is formed by the mode alignment arrangements of a plurality of light guide units 32 with the tiling tile, is called as watt to cover the formula backlight.
In addition, another structure example of expression backlight 22 in Fig. 8.In the light guide unit 32 that constitutes backlight 22 shown in Figure 7,2 light source 25L, 25R are configured near the central portion of two opposite edges of light conductor of rectangular shape, relative therewith, in the light guide unit 32 that constitutes backlight 22 shown in Figure 8,2 light source 25L, 25R are configured on the diagonal line in the bight of the light conductor of rectangular shape.
The structure of the included light guide unit 32 of expression backlight 22 in Fig. 9.Fig. 9 (a) is a planimetric map (vertical view) of observing (making this is upper surface side) under the situation of light guide unit 32 from display panels 23 sides.Fig. 9 (b) is the planimetric map (upward view) under the situation of the unilateral observation light guide unit 32 opposite with Fig. 9 (a).Fig. 9 (c) is the A-A sectional view of the light guide unit 32 shown in Fig. 9 (a).
Like this, in light guide unit 32, the mode in the zone that can not shine each other with 2 relative point source of light complementations is configured.
In Figure 10, schematically show direct of travel from the light of each light source 24L, the 25R that are arranged at light guide unit 32.Figure 10 (a) expression is arranged on the direct of travel of light of light source 25L in the left side of light guide unit during from top the observation, and Figure 10 (b) expression is arranged on the direct of travel of light of light source 25R on the right side of light guide unit during from top the observation.
As shown in figure 10,, can make the light-emitting zone of each light source overlapping, carry out luminous from the whole zone of the light-emitting area 27a of light conductor 27 by light source 25L and light source 25R are incident to relative configuration of mode of the inside of light conductor 27 with the light from each light source.In the present embodiment, a plurality of such light guide units 32 are arranged, can access the large-scale backlight that does not have dark portion by alignment arrangements.
As mentioned above,, as shown in Figure 5, when being subjected to scattering process and reflex, in light conductor 27, propagate, penetrate, arrive display panels 23 by diffuser plate 28 and optical sheet 29 from light-emitting area 27a from the light that light source 25 penetrates.
(about the homogeneity of brightness)
Herein, same with the situation of the backlight of tandem type, watt covering in the backlight of formula, also exist owing to produce the generation that the gap causes bright line each other at two adjacent conductors, damage the inhomogeneity problem of brightness.Below the principle of such brightness irregularities is described.
With use illustrated same of Figure 15, the light that penetrates from light source 25 carries out total reflection repeatedly in light conductor 27, penetrate from light-emitting area 27a.But, the part of the light that penetrates from light source 25, with situation shown in Figure 14 similarly, in light conductor 27, do not carry out total reflection, but directly arrival away from a side's of light source 25 end face 27e (with reference to Fig. 9 (c)).Such light is not because there is to produce the decay of the light quantity that is caused by total reflection, so its strength ratio is stronger from the light that light-emitting area 27a penetrates.
As shown in figure 11, suppose the situation that a light conductor (left side among the figure) and another light conductor (in figure right side) adjacent with this light conductor are arranged very close to each otherly, the light that spills from the end face 27e of a light conductor is incident to the end face 27e of another light conductor, total reflection is carried out in inside at this another light conductor, penetrate from light-emitting area 27a, therefore do not produce bright line.
But, when reality is used, as shown in figure 12, producing the gap on the border of a light conductor and another light conductor adjacent with this light conductor, the therefore light that penetrates from light source directly penetrates extremely outside from the end face 27e of light conductor.Therefore, the light that this intensity is stronger shows as bright line, and whole brightness becomes inhomogeneous.
As shown in Figure 5 and Figure 6, same with the structure of backlight 2 in the embodiment 1 in the present embodiment, for the amount that makes the light that penetrates from the end face 27e of light conductor reduces, light quantity adjustment part 31 is configured in light conductor 27,27 each other.
The particular location of configuration light quantity adjustment part 31 is identical with the structure of backlight 2 in the embodiment 1.That is, light quantity adjustment part 31 can contact configuration with end face 27e respectively in the mode of the end face 27e that covers each light conductor 27.In addition, also can constitute light quantity adjustment part 31 by the China ink of coating white, grey on the end face 27e of light conductor 27.
In addition, in each structure shown in above-mentioned embodiment 1 and 2, light quantity adjustment part 11,31 preferably outside the function that the transit dose that makes light reduces, also has and carries out function of reflecting to shining the light that comes.Thus, when the amount that makes the light that exposes to light quantity adjustment part 11,31 reduces, can also the light that expose to light quantity adjustment part 11,31 be reflected, therefore can make more light diffusion.Thereby can further improve the homogeneity of brightness.
As mentioned above, embodiment 1 and 2 liquid crystal indicator 1,21 have above-mentioned such backlight 2,22, thereby can therefore can improve display quality to the more uniform light of display panels 3,23 irradiations.
In addition, lighting device of the present invention, brightness uniformity is also very excellent under the big situation of light-emitting area change, and the backlight that therefore preferred especially conduct has the liquid crystal indicator of big picture uses, but be not limited thereto, it can be as the backlight of any liquid crystal indicator.
Lighting device of the present invention, as mentioned above, the light quantity adjustment part with the transit dose minimizing that makes light is configured in above-mentioned each light conductor structure each other.
Utilize above-mentioned structure, can reach the effect that realization can further improve the inhomogeneity lighting device of brightness.
In addition, liquid crystal indicator of the present invention as mentioned above, adopts to have the structure of lighting device of the present invention as backlight.
Utilize above-mentioned structure, can therefore can be able to improve the effect of display quality the more uniform light of display panels irradiation.
The concrete embodiment or the embodiment that in describing content of the present invention in detail, introduce, it only is the explanation of carrying out for clear and definite technology contents of the present invention, should only not be defined in these concrete examples and narrow sense make an explanation, in the scope of spirit of the present invention and right request, can carry out various changes and implement.
Utilizability on the industry
Lighting device of the present invention can be as the backlight of liquid crystal indicator. Lighting device of the present invention is specially adapted to the backlight of large-scale liquid crystal indicator.
Claims (13)
1. lighting device, it has a plurality of light sources and makes the light of at least one incident from this light source carry out the luminous a plurality of light conductors of face, and this lighting device is characterised in that:
Make the light quantity adjustment part of the transit dose minimizing of light be configured in described each light conductor each other,
Described light quantity adjustment part is to cover the mode of the end face that is positioned at this each light conductor border each other in described each light conductor, contact configuration with this end face, this end face is not reflect in this light conductor and the direct end face that arrives from the light that described light source penetrates and incides in the described light conductor.
2. lighting device, it has a plurality of light sources and makes the light of at least one incident from this light source carry out the luminous a plurality of light conductors of face,
Described each light conductor comprises: the illuminating part with light-emitting area; With will be from the photoconduction of described light source light guide section to this illuminating part, and be configured in the mode of the illuminating part that on the light guide section of a light conductor, is equipped with another light conductor adjacent with this light conductor,
This lighting device is characterised in that:
The light quantity adjustment part that the transit dose of light is reduced is configured between the illuminating part of the illuminating part of a described light conductor and described another light conductor,
Described light quantity adjustment part is to cover the mode of the end face that is positioned at this each light conductor border each other in described each light conductor, contact configuration with this end face, this end face is not reflect in this light conductor and the direct end face that arrives from the light that described light source penetrates and incides in the described light conductor.
3. lighting device, it has a plurality of light sources and makes the light of at least one incident from this light source carry out the luminous a plurality of light conductors of face, and this each light conductor is with mutual nonoverlapping mode alignment arrangements, and this lighting device is characterised in that:
Make the light quantity adjustment part of the transit dose minimizing of light be configured in described each light conductor each other,
Described light quantity adjustment part is to cover the mode of the end face that is positioned at this each light conductor border each other in described each light conductor, contact configuration with this end face, this end face is not reflect in this light conductor and the direct end face that arrives from the light that described light source penetrates and incides in the described light conductor.
4. lighting device as claimed in claim 1 is characterized in that:
Described light quantity adjustment part is made of the semipermeability material that the transit dose that makes light reduces.
5. lighting device as claimed in claim 2 is characterized in that:
Described light quantity adjustment part is made of the semipermeability material that the transit dose that makes light reduces.
6. lighting device as claimed in claim 3 is characterized in that:
Described light quantity adjustment part is made of the semipermeability material that the transit dose that makes light reduces.
7. lighting device as claimed in claim 4 is characterized in that:
Described semipermeability material is the China ink of grey.
8. lighting device as claimed in claim 5 is characterized in that:
Described semipermeability material is the China ink of grey.
9. lighting device as claimed in claim 6 is characterized in that:
Described semipermeability material is the China ink of grey.
10. lighting device as claimed in claim 1 is characterized in that:
Described light quantity adjustment part is reduced the transit dose of light, and has light is carried out function of reflecting.
11. lighting device as claimed in claim 2 is characterized in that:
Described light quantity adjustment part is reduced the transit dose of light, and has light is carried out function of reflecting.
12. lighting device as claimed in claim 3 is characterized in that:
Described light quantity adjustment part is reduced the transit dose of light, and has light is carried out function of reflecting.
13. a liquid crystal indicator is characterized in that:
Has in the claim 1 to 12 each described lighting device as backlight.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007205742 | 2007-08-07 | ||
| JP205742/2007 | 2007-08-07 | ||
| JP025689/2008 | 2008-02-05 | ||
| JP2008025689 | 2008-02-05 | ||
| PCT/JP2008/062850 WO2009019964A1 (en) | 2007-08-07 | 2008-07-16 | Lighting device and liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101680637A CN101680637A (en) | 2010-03-24 |
| CN101680637B true CN101680637B (en) | 2011-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008800173287A Expired - Fee Related CN101680637B (en) | 2007-08-07 | 2008-07-16 | Lighting device and liquid crystal display |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20100225572A1 (en) |
| CN (1) | CN101680637B (en) |
| WO (1) | WO2009019964A1 (en) |
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| US8414173B2 (en) * | 2007-07-27 | 2013-04-09 | Sharp Kabushiki Kaisha | Illumination device and display device |
| US20110109836A1 (en) * | 2008-07-07 | 2011-05-12 | Sharp Kabushiki Kaisha | Illumination device and liquid crystal display device |
| JP5161134B2 (en) * | 2009-02-23 | 2013-03-13 | 信越ポリマー株式会社 | Light guide member and electronic device |
| WO2010109731A1 (en) * | 2009-03-25 | 2010-09-30 | シャープ株式会社 | Illumination device, display device, and television receiving device |
| KR20110006773A (en) * | 2009-07-15 | 2011-01-21 | 삼성전자주식회사 | Display apparatus |
| JP5286206B2 (en) * | 2009-09-11 | 2013-09-11 | 日立コンシューマエレクトロニクス株式会社 | Liquid crystal display |
| JP5322892B2 (en) * | 2009-11-06 | 2013-10-23 | シャープ株式会社 | LIGHTING DEVICE, DISPLAY DEVICE HAVING THE SAME, AND TV RECEPTION DEVICE |
| TWI406056B (en) * | 2009-12-04 | 2013-08-21 | Au Optronics Corp | Backlight module structure |
| EP2385419B1 (en) * | 2010-05-04 | 2013-09-11 | LG Innotek Co., Ltd. | Back light unit with light-guiding modules |
| JP5751922B2 (en) * | 2011-05-09 | 2015-07-22 | キヤノン株式会社 | Light emitting device and display device |
| JP2013012422A (en) * | 2011-06-30 | 2013-01-17 | Hitachi Consumer Electronics Co Ltd | Backlight device, and liquid crystal display device using the same |
| CN108761910A (en) * | 2018-05-28 | 2018-11-06 | 京东方科技集团股份有限公司 | Electronic equipment, display device, backlight module and its light source |
| CN113990211B (en) * | 2021-11-15 | 2022-11-01 | Tcl华星光电技术有限公司 | Display screen and display device |
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| JP3373427B2 (en) * | 1998-03-31 | 2003-02-04 | 日東樹脂工業株式会社 | Tandem type surface light source device |
| KR100654220B1 (en) * | 1999-08-03 | 2006-12-05 | 삼성전자주식회사 | Liquid crystal display device |
| JP2001184929A (en) * | 1999-12-24 | 2001-07-06 | Nec Corp | Plane light source apparatus and liquid crystal display provided with it |
| JP2001312916A (en) * | 2000-02-24 | 2001-11-09 | Sony Corp | Surface light source device |
| JP4023079B2 (en) * | 2000-08-31 | 2007-12-19 | 株式会社日立製作所 | Planar illumination device and display device including the same |
| JP3670949B2 (en) * | 2000-09-27 | 2005-07-13 | 三洋電機株式会社 | Surface light source device |
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| WO2009017066A1 (en) * | 2007-07-27 | 2009-02-05 | Sharp Kabushiki Kaisha | Lighting device, display device, and light guide plate |
| US8436962B2 (en) * | 2007-07-27 | 2013-05-07 | Sharp Kabushiki Kaisha | Illumination device and liquid crystal display device |
| US8414173B2 (en) * | 2007-07-27 | 2013-04-09 | Sharp Kabushiki Kaisha | Illumination device and display device |
| WO2009098809A1 (en) * | 2008-02-05 | 2009-08-13 | Sharp Kabushiki Kaisha | Illuminating device and liquid crystal display device |
| RU2456502C2 (en) * | 2008-05-30 | 2012-07-20 | Шарп Кабусики Кайся | Lighting device, display device and light-conducting plate |
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2008
- 2008-07-16 US US12/599,853 patent/US20100225572A1/en not_active Abandoned
- 2008-07-16 WO PCT/JP2008/062850 patent/WO2009019964A1/en active Application Filing
- 2008-07-16 CN CN2008800173287A patent/CN101680637B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101680637A (en) | 2010-03-24 |
| US20100225572A1 (en) | 2010-09-09 |
| WO2009019964A1 (en) | 2009-02-12 |
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